Enable Customizer
Open WHMCS > Templates > Digit > header.tpl, search for
{$headeroutput}
after it add the following line
{* Customizer *}
{include file="$template/wdes/wdes-customizer.tpl"}
Open WHMCS > Templates > Digit > header.tpl, search for
{$headeroutput}
after it add the following line
{* Customizer *}
{include file="$template/wdes/wdes-customizer.tpl"}